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Officials said the 2-year-old boy, who was identified as Daylan Walker, was at a family day care center at 129 Columbia Road when somehow he managed to get from the first floor to the roof before falling at least four stories to the ground below.

"At present, what the Boston police are doing in conjunction with the District Attorney's Office is we're canvassing the entire neighborhood, including the building behind us, the surrounding neighborhoods for any and all potential witnesses, and we would ask that if anybody has any information -- contact the Boston Police Department," said Boston Police Chief William Gross.

According to the Department of Early Education and Care, the family day care center was first licensed in 2006 to Marisol Ramos and was renewed in April 2013. According to EEC, Ramos was informed that she can no longer operate the day care, pending the outcome of the investigation.

Daylan's family is now demanding answers about how the accident occurred.

"I took the boy to day care. He was very happy when I took him," Lucrecia Rivera, Daylan's grandmother, said. "I rang the doorbell to the day care and her son opened the door and took the child. I was in the living room, and she came out of the kitchen to take him and the boy had a terrible reaction like he was scared."

Speaking in Spanish, Rivera said when she left she called her daughter, Daylan's mother, and said she didn't like his reaction.

"She told me, 'I told you so. Since last week, every time I drop him off he starts crying,'" she said.

Rivera said Daylan had been at the day care for only a few weeks.

"No sooner do I finish talking with my daughter that (the day care provider) sends her a text message that her son is fine, quiet and playing," Rivera said. "Fifteen minutes later she sends a photo that the child was fine. Fifteen minutes later the police call her that the boy was at the medical center."

Rivera said Daylan never had access to the stairs in the building. She said there were two doors with controlled access, and even if he did get out of the apartment he wouldn't be able to get up there alone.

"None of the tenants have access to the roof," she said. "It's locked. Only maintenance has access. It's a very heavy door. How is it possible for the boy to get up to the roof?"

Rivera said she doesn't want Daylan's death to go unpunished.

"I only ask for justice because today it happened to us, but there are lots of families out there who drop their children off at day care and go to work trusting that (their children) are going to be well cared for, never suspecting that they would end up in a grave," she said.

Officials with the Suffolk County District Attorney's Office said the investigation remains active, but at this point no charges are imminent.